Parallel attachment for drawing boards



Patented May 22, 1923,

mamas pair eras career QFFHQEO HUDSON A. TEDMAN, 0F GALESBURG, ILLINOIS, ASSIGNOR 'iO WINSLOW BOILER et ENGINEERING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 01" ILLINOIS.

SAFETY DEVICE FOR OIL-BURNING SYSTEMS.

Application filed l 'une 21, 1921, Serial No. 479,223.

To all whom it may concern Be it known that I, HUDSON A. TEDMAN, a citizen of the United States, residing at Galesburg, in the county of Knox and State of Illinois, having invented certain new and useful Improvements in Safety Devices for Oil-Burning Systems, do hereby declare that th following is a full, clear, and exact description of the same, reference being had to the accompanying drawings.

The invention relates to certain new and useful improvements in safety-devices for oil burning systems, and its primary object is to provide an improved apparatus for safely producing a periodical flame from a mixture of air and atomized oil, and particularly means for automatically stopping the motor and the supply of fuel-oil to the burner in case the system fails tofunction, as for example if the oil is not sufliciently atomized or the air supply is insufficient to provide a combustible mixture of oil and air,

or if the ignition device does not ignite the fuel mixture.

In oil burning systems or plants using heavy and mixed with a supply of air to form the combustible mixture, which then is ignited by a suitable pilot light or electric spark, and as these systems are usually intermittent in their heating action on the steamgenerator or boiler, operating in accordance with the varying thermal conditions in the device being heated they are usually provided with means for periodically starting and stopping the motor that drives the blower to supply the combustion air to the burner. However, these means do not otherwise control the system and if there is a failure to produce or ignite the combustible mixture in the burner when an operative period occurs the fuel-oil continues to flow to the burner.

My inventionprovides improved means for automatically stopping the motor and flow of fuel-oil to the burner after a small quantity of this oil has passed to the burner under any condition that fails to produce a combustible mixture or ignite it, and so prevents the accidental accumulation or waste of oil and the danger of explosion of the vapor arising from its natural vaporization in the restricted area of the fire-box or boiler-room. a

In the accompanying drawings Fig. 1. is

grades of fuel-oil the oil is atomized.

Renewed March 15, 1923.

a side elevation of a device embodying the features of my invention with a detail sectional view of a suitable fire-pot or burner; Fig. 2 is a detail view of the automatic tripdevice, and Fig.3 is a detail sectional view of a form of electro-magnetic valve that maiy b employed.

. n the drawings the reference numeral 1 indicates a combustion-chamber or fire-pot of suitable size and shape to conform to the design of the associated steam-boiler, and to which fuel-oil is supplied by a fuel-pipe 2. A low-pressure blower 3 is mounted on a base-plate 4 and is provided with an air tube 5 which is connected at its outlet to the fire-pot to furnish the combustion-supporting air; the air-tube preferably is divided at its outlet into two branches or conduits arranged tangentially to the interior of the fire-pot to deliver air to the pot in two lateral streams on opposite sides of the nozzle 6 of the fuel-pipe 2. The conduits are suitably connected to the fire-pot, and these parts are provided with supports 7 and 8.

The blower is driven by an'electric motor 9, which is mounted on the base 4 and is connected in an electric circuit 10 having any suit-able source of current, and the circuitmay be controlled to start and stop the motor by any usual device such as the switch 8, which may be operated by hand or any suitable means operating in accordance with varying thermal conditions in the device being heated. When fuel-oil is supplied to the fire-pot through the pipe 2 andthe motor is operated the blower or fan 3 delivers a suflicient quantity of air through'the tube 5 to mix with the oil to form a readily combustible mixture and ensure perfect combustion of the fuel so The distributer plate is preheated by the lighting flame so that the initial oil falling on it is more quickly and thoroughly vaporized to accelerate its mixture wit-h the air Patented Sept. .18, i

ARTHUR r. Lmsnne, or sToarA, new Yau,hssrertoa Tonnw YORK BLUE ran-I V V PAPER COMPANY, a ooerossrron new Your;

PARALLEL ATTACHMENT non D's-swine BOARDS.

.Applieation filed September 14, 1920. Serial No; 410, 116.

new and useful Improvements in Parallel Attachments for Drawing Boards, of which the following lsa specification. V

This invention relates to lmprovements in parallel attachments for" drawin boards.

The object of: the invention is to provide a generally improveo parallel attachment adapted to be manufactured at low costand easily and quickly attachedto the drawing board. Another objectof the invention is "to provide a parallel attachment adapted to beiusedwith'a drawingiboard of greater length than the straight edge used in the attachment. ects in view the invention is embodied 1n ments and arrangements thereof as are hereinafter set forth while reference is had to the accompanyingidrawings in which,

Fig. 1 is a plan view of a drawing board equipped with the attachment;

Fig. 2 is a plan view of the pulley bracket attached to the left hand end of the straight edge.

. Fig. 3 is a view of'Figtu'e 2 looking in the direction of arrow 3 in said figure.

Fig. 4 is a side view of the pulley bracket.

Fig. 5 is a plan view of the right hand bracket on the straight edge.

I Fig. 6 is a View of Figure 5 looking in the direction of arrow 6 in Figure 5.

Fig. T'is a side view of the left hand bracket. 7

Fig. 8 is a plan view of the locking means for the cord which operates the straight edge.

Fig. 9 is a side view thereof showing the locking means closed.

Fig. 10 is a side view showing the locking means open. V

Referring to Figure 1 the reference numeral 1 denotes the drawing board. To the latter is suitably secured four brackets marked 2, 3', 4 and 5 respectively. 6 is the straight edge which may be of any suitable construction and is provided with two parallel grooves 7 and 8 running the length of the straight edge. On the left hand end the straight edge is provided with a pulley bracket 9 which is bent in the form edge 6 while the int With the above and other 0b.

of a Z. One arm carries the double pulley 10, the other am is srcnred to the straight r nediate or verticz'i-l portion 11 is adapted to slide along the edge of the drawing board 1.

The other or right hand end of the straight edge carries a bracket 13 having two rollers 14 and 15. The bottom 16 of the bracket 13 is flush with the drawing boards upper surface. The brackets may conveniently be attached with screws 17 as shown.

The brackets are mounted on the straight edge so that the verticalpoi 'tions 1.1 and 18 respectively of the left and right hand brackets lie close to the ends of straight edge and the said vertical portions of the brackets are further apertured' as at 19! 20 and 21. 22 as indicated in Figures 2 and 5'.

To the upper edge 23 of the drawing board and preferably central thereof is secured a locking means 25 comprising a plate 26 screwed fast to the drawing board and which plate carries a spring 27 adapted to be closed down upon the platc26 bv means of a pivoted cam 28 operable by a lever 29. The spring has a hole or aperture at PM.

31 denotes a cord which is scoured at its one end 35 to the bracket 2 and thence passes around the pulley 10. through aperture 20 in the bracket 9. thence through groove 7.. aperture 22. around roller l t, through an eve in bracket 1, through the locking device by passing between the spring 27 and the plate 26. thence upward through the hole 30in the spring. thence through an eye in bracket 3. thence again around the pulley 10, through hole 19. through groove 8. through hole 21 in bracket 13. thence around roller 15 and the other free end is secured to bracket 5.

In using the attachment it is placed on the drawing board as shown in Figure 1. and bracket 9 is placed with its portion 11 against the side 12 of the drawing board thus placing the straight edge at ninety de-' grees to the said edge 12 and thereafter the cord is pulled tight and tied. hen the lever 29 of the locking" means 25 is moved down the cam 28 presses the spring 27 firm" lv down and the cord is then securely clamped between said spring and the plate 26 and the cord'cannot move.

Thus the stralght edge remains securely 1n its position at nlnety degrees to the side up or down without changing its. position relative to said edge 12] Any accidental push at either end of the straight edge which would tend to brine it out, of posi tion is firmlyzresisted by the cord. The cord portions in the'grooves 6 and 7 pull again st each other.

If it is desired to use the straight edge in any other position as for instance that shown at 50 in dotted lines, the lock at is unlocked, thestraia'ht edge shifted to the desired position after which the lock is locked and the straight edge may then be used in the new position.

One particular advantage ol the forecoing arrangement resides in, the fact that the cord is not crossedupon itself hence wears lon z er. Also that the cords are underneath and in the straight edge. hence are not in the'wa v and present no obstacle to the user of the l'ioard. It is a particular and important feature of this invention, that the co (ls-rest and operate in open grooves. 'Heretotore it has been proposed to construct parallel attac-luueuts in which the cords pass through closed grooves or channels in the straight edge. In such such cases, when the 'cordabreak or wear out,rit is necessary toentirely disassemble the straight edge in order to provide new cords. This frequently causes breakage of the straight edge, besides being expensive and involving work, which can only be done by skilled labor. With this invention, howe.'er.-the dra'ttsmau himself can easily and quickly repair a" broken cord.

Again, Figure 7 shows that the board may extend to the right beyond the bracket llas shown in dotted lines at 60 in which cas the brackets 4: and 5 may be slightly raised if desired to permit the right end 'cord portions to pass above the drawing flormpnevertheless changes and modificaboard, r

' It will further be understood that while the invention is shown in its preferred tions may be'madein the detailed construction without departing from the spirit of the invention or the scope of theappended claiinfl H I cla1m: p i The combination with a'drawlng board,

cilaparallel attachment therefor comprisinn a straight edge provided with two parallel longitudinally extending "open grooves inthe under surface otsaid straight edge, means permitting parallel 'mouement oi said straight edge over the face of the drawing board consisting of a plurality of apertu'red corner brackets secured to p the four corners of thesaid drawing board, a

guide bracket secured to the one end of the straight edge, a double grooi-ed pulley mount ed above said lateral extension, a s'econd bracket secured to the opposite'endqot the straight edge, said second bracket having a lateral extension flush with the lower surface of the straight edge, two. separate single pulleys securedv above S ZtlCl 'SBCOD ClV lateral extension, a single cable-having one of its free ends'secured to-one of the, said corner brackets, said cable .then passing around the said double pulley 1n one of its grooves, the-nee through one of the said open grooves in thestraight-edgeito one of the said single pulleys, thence around the drawing board and through two of the said corner brackets, thence back to and .around the said double pulley in the' other groove thereof,v thence through the second open groorein the straight edge, thence around the second o-ii'the two singlepulleys aforesaid, thence back to the fourth of thesaid corner brackets, where the other free end of the cable is secured, and locking means for said cable secured to the upper side or j the said'drawing board.

ARTHUR F. L INSNER, 

